|Mane:||Purple With White Streaks|
|Voiced by:||Chantal Strand|
|Coat Color:||Pale Magenta|
Diamond Tiara is an Earth Pony who goes to school with Apple Bloom and her partner Silver Spoon. She and Silver Spoon make fun of the CMC for not having any cutie marks, which makes her a bully. Her cutie mark is 1 tiara. She is a light purple Earth Pony with a purple and white mane and blue eyes. In One Bad Apple, she befriended Babs Seed and turn them against the CMC, but Babs turned against her by the end of the episode.